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## Homework Statement

The mass of a single HE atom is 6.65e-27kg. You have 5.00e-6 mole of HE gas which is occupying a volume of 1.00e-4m^3. when at pressure of 100Pa. Determine the temp of gas AND the average speed of the gas molecules.

**I've found the temp of gas i need help on the avg speed - i believe i'm close

## Homework Equations

Vrms=[tex]\sqrt{3(R)(T)/(M)}[/tex]

## The Attempt at a Solution

Vrms=[tex]\sqrt{3(8.31J/mol K)(241)/(6.65e-27kg????)}[/tex]

i'm not certain if i use 6.65e-27kg as molar mass?